Improper locking in Linux kernel - CVE-2026-31556
Published: April 25, 2026
Vulnerability identifier: #VU127848
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31556
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock release in xchk_quota_item when handling quota scrub error processing. A local user can trigger an early return that leaves dq->q_qlock held to cause a denial of service.
How to mitigate CVE-2026-31556
Install security update from vendor's repository.